<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>learn selenium</title>
    <style>
        html,body{
            height:100%
        }
    </style>
</head>
<body>
    <iframe id="button-frame" name="my-frame"  src="https://seleniumhq.github.io" height="100%" width="100%"/>
</body>
</html>